Design and Implementation of a High Step-Up DC-DC Converter Based on the Conventional Boost and Buck-Boost Converters with High Value of the Efficiency Suitable for Renewable Application

Abstract

This paper introduces a novel topology of the proposed converter that has these merits: (i) the topology of the converter is based on conventional boost and buck-boost converters, which has caused its simplicity; (ii) the voltage gain of the converter has provided higher values by the lower value of the duty cycle; (iii) due to the use of high-efficiency conventional topologies in its structure, the efficiency of the converter keeps its high value for a great interval of duty cycle; (iv) besides the increase of the voltage gain, the current/voltage stresses of the semiconductors have been kept low; (v) the continuous input current of this converter reduces the current stress of the capacitor in the input filter. It is worth noting that the proposed converter has been discussed in both ideal and non-ideal modes. Moreover, the operation of the converter has been discussed in both continuous/discontinuous current modes. The advantages of the converter have been compared with recently suggested converters. In addition, the different features of the converter have been discussed for different conditions. In the small-signal analysis, the appropriate compensator has been designed. Finally, the simulation and experimental results have been reported for 90 W output power, 90 V output voltage, 3-times voltage gain, and 100 kHz switching frequency.

A Quadratic Buck-Boost Converter With Continuous Input and Output Currents

“…The proposed topology has higher extracted inductor loss than [1]- [8] and [8]- [14], but lower extracted switch loss than [2]- [4], [7], [8], [12]- [14]. The diode conduction loss in the proposed converter is lower than [1]- [4], [7]- [9], [12]- [14], but higher than [5], [6], [11]. The proposed efficiency is higher than [2]- [4], [7], [8], [12]- [14], but similar to [1], [5], [6], [9]- [11].…”

“…The diode conduction loss in the proposed converter is lower than [1]- [4], [7]- [9], [12]- [14], but higher than [5], [6], [11]. The proposed efficiency is higher than [2]- [4], [7], [8], [12]- [14], but similar to [1], [5], [6], [9]- [11].…”

“…Therefore, each inductor should have a minimum value to ensure that the converter operates in CCM. It's worth noting that the minimum value of each inductor required to maintain the converter's operation in CCM, as per equation ( 5), can be expressed using equation (6).…”

“…However, the voltage stress of the second diode is higher than the output voltage, which is caused by the replacement of the first capacitor and diode in the first part. The proposed converter in [6] combines the conventional buck-boost and boost converters to provide a voltage gain that is the summation of the consisting parts. The output capacitor voltage is divided between two capacitors to reduce the output capacitor voltage stress.…”

State-Feedback Control of Interleaved Buck–Boost DC–DC Power Converter with Continuous Input Current for Fuel Cell Energy Sources: Theoretical Design and Experimental Validation

“…Furthermore, the proposed topology of the Buck-Boost conver Indeed, the static (current-voltage) characteristic of PEMFC, shown in Figure 2, is nonlinear [6,7] and depends on the thermodynamically predicted fuel cell voltage output and the following three majors losses: activation losses (due to electrochemical reaction), ohmic losses (due to ionic electronic condition), and concentration losses (due to mass transport). Therefore, PEMFC systems need to use the DC-DC power converters to supply regulated and stable power to the different loads and equipment [8][9][10][11][12][13][14][15][16][17][18][19][20][21]. Classical DC-DC power converters of Boost and Buck converters are widely used in the fuel cell system [22][23][24][25].…”